Flat Green Bowls - Foot Faults.

At the moment of releasing the bowl or jack, one foot must be completely on or above the mat.
If a player foot faults, he is warned by the umpire. If he continues to foot fault, the umpire may have the bowl stopped and declare it dead.
Standing On The Mat.
If an invalid bowl disturbs the jack or a valid bowl, the opponent may choose to leave the jacks or bowls in position, reset them, or have the end replayed.